WASHINGTON (JTA) — U.S. Sens. Joseph Lieberman and Mark Kirk have written a letter to Secretary of State Hillary Clinton expressing their disappointment with Israel’s exclusion from the inaugural meeting of the Global Counterterrorism Forum.

In the letter, Sens. Joseph Lieberman (I-Conn.) and Mark Kirk (R-Ill.) told Clinton that “there are few countries in the world that have suffered more from terrorism than Israel, and few governments that have more experience combating this threat than that of Israel.”

“One of the stated missions of the GCTF is to ‘provide a needed venue for national [counterterrorism] officials and practitioners to meet with their counterparts from key countries in different regions to share [counterterrorism] experiences, expertise, strategies, capacity needs and capability-building programs.’ We strongly believe that Israel would both benefit from, and contribute enormously to, this kind of exchange,” Lieberman and Kirk wrote.

Israel had not been invited to the forum allegedly due to objections by Turkey, which also blocked Israel’s participation in the recent NATO summit in Chicago.

Israeli Foreign Ministry spokesman Yigal Palmor told the Times of Israel that the Israeli government will participate in working groups formed by the forum, and said that Israel had not been planning on attending the meeting.

The rift between Israel and Turkey has been ongoing since the Mavi Marmara incident in May 2010. Israeli commandos killed nine Turkish citizens during a hostile exchange after the ship tried to run Israel’s Gaza maritime blockade.

Kirk, who suffered a stroke in January, is still recovering in Chicago, while Lieberman is completing his final term as a U.S. senator.